Drill mechanism



Feb.'` 11, 1936. f K, JEFFREY' 2,030,637

I DRILL MECHANISM Original Filed Sept. 24, 1930 /M/ENTOR: Robe/ Je ffrey,

Patented Feb. 11', 1936 UNITED STATES PATENT GFFIQE DRILL MECHANISM Robert K. Jeffrey, Columbus, Ohio, assigner to` The Jerey Manufacturing Company, a corporation of Ohio 17 Claims.

This invention relates to an improvement in drills of the type wherein means are provided for feeding a drill bit or auger while the drill is operating to drill or bore a hole, as, for example, in the face of a coal mine room, which borehole is adapted to receive a blasting charge.

An object of the invention is to provide a simple yet highly expedient means which will feed a drill bit or auger during operation of the drill motor and which may be manipulated to permit ready retraction and removal of the bit or auger carrying feed shaft.

A more specific object of the invention is to provide a rotatable feed nut for a drill Which,

f when rotated with respect to a drill screw shaft,

Will feed said shaft, and which is so formed as to be readily releasable from said screw shaft to permit free sliding movement thereof.

Other objects of Vthe invention will appear hereinafter, the novel features and combinations beingset forth in the appended claims.

In the accompanying drawing:

Fig. 1 illustrates a drill including my invention, in actual operation;

, g Fig. 2 is a' plan view of the rotatable nut and associated elements which comprise my invention;

Fig. 3 is a longitudinal sectional View of my invention taken on the line 3 3 of Fig. 2 looking in the direction of the arrows; and

Fig. 4 is a transverse sectional View of my invention taken on the line 4-4 of Fig. 3 looking in the direction of the arrows.

lThis application is a division of my application Serial No. 484,190 for a Drill mechanism, filed September 24, 1930,

Y Referring to Fig. 1 of the drawing, there `is seen a mine drill I mounted upon an extensible supporting post II and having a drill or auger I2 adapted to drill or bore a hole in the face of a mine room. The structural details of said mine drill III and post I I are described in full detail in my above mentioned application.

- It will suffice for a complete understanding of theparticular invention herein involved to point out that the drill or auger I2 is rotated at a re1- atively high speed by the screw shaft I3 which is driven by the motor of the mine drill I0.

The auger l2 is rigidly but removably attached tothe screw shaft I3 by a socket I4 which has a barrel portion I5 rigidly attached to one end of the shaft I3 by rivets I3 and has a portion II provided with a rectangular recess adapted to re-` ceive the tail piece or shank I8 of the auger I2. Said auger tail piece I8 is provided with a trans- (Cl. Z55-46) versely extending groove I 9 which, when the auger is assembled, is opposite a transversely extending groove 20 in the socket portion I`I. A spring retained rotatable pin 2l is milled on one side and extends through the groove 2l! in socket portion Il. Said pin 2| is adapted to remain in either of two positions which are 180 degrees apart, by an appropriate co-operating pin 22 and transverse groove 23. Spring 2f! permits turning of the pin 2| by knurled head 25 thereof. When pin 2l is in the position illustrated in Fig. 3, the auger I2 will be clamped in socket I4. By rotating said pin 180 degrees, the .auger I2 may be readily removed from said socket.

As was above set forth, the shaft I3 is driven from the motor of drill I0 to rotate the auger I2 at a relatively high speed. To provide a feeding of the auger I2, the shaft I3 is screw threaded and relative rotation is provided between a feed nut 26 and said shaft I3, whereby the shaft I3 will move longitudinally through said feed nut 26. When a feeding operation is to be performed, both the feed nut 26 and the shaft I3 are rotated at a relatively high speed but the feed nut 2G is rotated at a speed slightly higher than the speed of shaft I3. This rotary movement of said feed nut 23 is through sleeve 21 which is keyed to casing 28 thereof by key 28'. Due to the relative rotation between feed nut 26 and shaft I3, -a feeding of the latter will be effected.

The feed nut 26 comprises the casing 28 having a cylindrical outer Wall and a pair of inwardly extending flanges or webs 29 and 30 which form a peripheral pocket 3 I. A pair of elongated semi.- cylindrical nut segments or sectors 32 is provided having threads on their inner surfaces adapted to co.operate with the threads on shaft I 3. Each of said nut segments or sectors 32 is provided with a pair of axially spaced ears or lugs 33 adjacent one end thereof. The ears or lugs 33 are provided with aligned apertures adapted to receive pins 34 extending through suitable holes in flanges 29 and 30.Y The axis of said apertures is parallel with the axis of the nut sectors 32. The nut segments or sectors 32 are thus pivoted to thecasing 28 on said pins 3i. Said pins 34 are held in the casing 28 by shoulders 33 on said casing and by Cotter pins 3? projecting through them.

Flanges 29 and 30 col-operate with ears 33 to prevent longitudinal movement of the nut sectors 32 with respect to said casing 28.

Coil springs 38 are wound around the pins 34 and each has one free end 39 which bears against the inner surface of casing 28 and the other free end .40 of which cofoperates with a nut sector 32 biasing said nut sector 32 about pin 34 whereby it will tend to disengage the threads on its inner surface. from the threads on the shaft I3. It is thus evident that nut sectors 32 are normally urged to a thread disengaging relation with respect to shaft I3.

To maintain the threads of nut sectors 32 in engaging relation with the threadsV of shaft I3, sleeve 4I is provided, which is adapted to slide over the'nut sectors 32.

tent ft2 of usual construction, adapted to fit in a grooveY 33 in the periphery of the nut sectors 32.

It will be evident that the sleeveV 4I may be readily slipped over the nut sectors 32 and retained in position by the detent l2 whereby upon any relative rotary movement taking place with respect to the shaft I3 and the feed nut 23, the shaft I3 will move longitudinally with respect to said feed nut 26. It vis also evident that sleeve el may be readily removed from the nut sectors 32 and when this is done the springs 39 will auto- Y Vmatically move the nut segments 32, 32 out of meshV with the shaft I3 which will then be free to slide. Ready removal of said shaft I3 from the drill is thereby effected.A

While the nut sectors 32, 32 are held in mesh with the screw-threaded shaft I3 a spring pressed detent '32 holds the sleeve 4I over the extending semi-cylindrical nut sectors 32, as shown in Fig. 3. When the shaft I3 is rotated by means of the motor operated mechanism in the casing 45, the drill VI2 is rotated and at thesame time fed into the coal vein, as illustrated in Fig. l. When the drill is being operated to feed, the casing 28 is rotated faster than shaft I3 relative to the extensions M5, 44', from the motor in casing 135 through the sleeve 2'! and when the drill is retracted the casing 28 is held stationary. Consequently while the device is operating to retract the drill I2, the sectional nut structure 26 is held stationary. When the device is operating to advance the drill, nutV 26 rotates at a high speed. Ample space is provided for removal of the sleeve 4I from the nut sectors 32 back of the drill socket Il, and when the sleeve 4I is removed from the nut sectors 32, the latter will be automatically disengaged from the screw shaft I3 by the springs 38, 38.

VObviously those skilled in the art Ymay make l various changesV in the details and arrangement of parts without departing from the spirit :and scope of the invention as dened bythe claims hereto appended, and I wish therefore not to be restricted to the precise construction herein disclosed.

Having thus described and shown an embodiment of my invention, what I desire to secure by Letters Patent of the United States is:

1. In apparatus of the class described, a. feed nut comprising a plurality of segments, means mounting the segments for pivoting about axes eccentric to the axis of the nut, means'tending to move the segments to inoperative position about` their pivotal axes, and means adapted to engage theV segments and hold them in operative relation.

V2. In apparatus of the class described, a feed nut comprising a plurality of segments, means. mounting the segments for'pivoting about axes This sleeve 4I is pro-VV Vvided at its outer endrwith a spring pressed denut comprising a plurality of segments, means and a lug projecting radially outwardly from said Y nut portion adjacent a lateral edge thereof, said lug being provided with a bore substantially parallel to the axis of said nut portion.

5. For use in apparatus; of the class described, a nut portion of substantially semi-cylindrical shape, said nut portion being axially elongated, and a pair .of lugs projecting radially outwardly from said nut portion adjacent a lateral edge thereof, said lugs being spaced longitudinally of said nut portion and being provided with aligned bores substantially parallelto the axis of said nut portion.

6. For use in apparatus of the Vclass described, Va nut portion of substantially semi-cylindrical shape, said nut portion being axially elongated, and a lug projecting radially outwardly from said nut portion adjacent a lateral edge thereof,

. said lug having provisions for the pivotal mounting of said nut portion on an axis parallel to the axis of said nut portion.

'7. For use in apparatus of the class described, a feed nut housing comprising a substantially Y cylindrical body provided with an axial opening,

a feed nut housing comprising a substantially cylindrical body provided with an axial opening, said body having radially inwardly extending webs `dening an annular cavity therebetween and surrounding said opening, there being aligned apertures in said webs at circumferentially spacedV points, and a shoulder on said body spaced outwardly from one of said webs, and partially blocking the outer ends of the apertures in said one of said webs. Y

9. In apparatus of the class described, a feed nut comprisng a plurality of segments, a carrier to which sai'd segments are pivoted on axes parallel to the axis of the nut, said segments being swing.,

able about their said axes between operative and inoperative relations, and means for holding the segments in operative relation. i Y

10. In apparatus of the class described, a feed nut comprising a plurality of segments, a carrier to which said segments are pivote'd on axes parallel to the axis of the nut, said segments being swingable about their said axes between Voperative and inoperative relations, and means for holding the segments in operative relation,V said last named means comprisingV a ring embracing the segments.

11. In a drill mechanism feed nut, the combination with a plurality of nut segments having threaded inner surfaces forming a nut, means mounting the segments for pivotal movement about axes eccentric to the axis of the nut, and releasable means adapted to engage the segments and to hold them in operative relation, said means comprising a. removable sleeve adapted when removed to permit movement of said segments to an inoperative relation.

12. In a drill mechanism feed nut, the combination with a plurality of elongated nut segments having threaded interior surfaces, apertured ears at one end of said segments, means co-operating with said ears for mounting said segments for pivotal movement about axes eccentric to the axis of the nut, and releasable means adapted to engage the segments and to hold them in operative relation, said means comprising a removable sleeve slidable over the free ends of said segments.

13. In a drill mechanism feed nut, the combination with a plurality of elongated nut segments having threaded interior surfaces, apertured ears at one end of said segments, means co-operating with said ears for mounting said segments for pivotal movement about axes eccentric to the axis of the nut, and releasable means adapted to engage the segments and to hold them in operative relation.

14. In a drill mechanism feed nut, the combination with a casing having spaced inwardly extending webs forming a peripheral pocket, of nut segments having threaded inner surfaces forming a nut, ears on said segments extending between said webs and into said pocket, pins projecting through said webs and ears and mounting said segments for pivotal movement on axes spaced from the axis of said nut, springs coiled about said pins urging said segments into inoperative position, and releasable means adapted to maintain said segments in operative relation, said means comprising a sleeve slidable over said segments.

15. In a drill mechanism feed nut, the combination with a casing having spaced inwardly extending webs forming a peripheral pocket, of nut segments having threaded inner surfaces forming a nut, ears on said segments extending between said webs and into said pocket, pins projecting through said webs and ears and mounting said segments for pivotal movement on axes spaced from the axis of said nut, and releasable means adapted to maintain said segments in operative relation, said means comprising a sleeve slidable over said segments.

16. In a drill mechanism feed nut, the combination with a casing having spaced inwardly extending webs forming a peripheral pocket, of nut segments having threaded inner surfaces forming a nut, ears on said segments extending between said webs and into said pocket, pins projecting through said webs and ears and mounting said segments for pivotal movement on axes spaced from the axis of said nut, springs coiled about said pins urging said segments into inoperative position, and releasable means adapted to maintain said segments in operative relation.

17. In a drill mechanism feed nut, the combination with a casing having spaced inwardly extending webs forming a peripheral pocket, of nut segments having threaded inner surfaces forming a nut, ears on said segments extending between said webs and into said pocket, pins projecting through said webs and ears and mounting said segments for pivotal movement on axes spaced from the axis of said nut, and releasable means adapted to maintain said segments in operative relation.

ROBERT K. JEFFREY. 

